File I/O - OPEN

$ OPEN logical_name filespec

$ OPEN

/ERROR=label

/READ

/WRITE

/SHARE={READ|WRITE}

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The OPEN statement establishes a “channel identifier” which you can use in READ and WRITE statements as well as in the CLOSE statement to finish using the file.

/READ opens the file for reading. The file must exist.

/WRITE opens the file for writing. If not accompanied by /READ, a new file is created.

/SHARE specifies how other I/O streams may use the file.

/ERROR is used to specify a label where control should be transferred when an error occurs.